Intangible assets include social intangible assets and natural intangible assets, among which intangible assets usually include patent rights, non-patented technologies, trademark rights, copyrights, concessions, land use rights and so on. Natural intangible assets include (1) the patent right of natural resources such as natural gas without physical form: it refers to the exclusive rights granted by the national patent authority to the applicant for a patent for invention and creation within the statutory time limit, including the patent right for invention, the patent right for utility model and the patent right for design. (2) Non-patented technology: also known as proprietary technology, refers to various technologies and proprietary technologies that are not known to the outside world, should be adopted in production and business activities, and can bring economic benefits without legal protection. . . . . .